The recordings I use for the "forward vocals test" are Taylor Swift (2nd CD) and the first few tracks from Madonna Immaculate Collection.

Lol. Never listened to any Taylor Swift or Madonna... I'll give those albums a listen though.
Also, where was the bass adjuster at with this measurement? This looks drastically different from Rin's measurement, but after all this pair was rebuilt by Aursonics...

Kinda matches what I heard, except the 10k peak perhaps. I didn't find these to be that reduced in mids, but they definitely had a cut.
Pair-by-pair difference perhaps.

Perhaps the closest relative in FR (but not much else) is Paradox, or at least the pair I have, both close to electrically flat presentation.
I cannot say about bass, I didn't have the Paradox back when listening to a "demo pair".

I can't say about how equalizable ASG-2 are, since they're BA, likely not that well.

Completely off-topic, anyone have experience with IEMs that DO sound like the Paradox?

1/24 smoothed curves per vwinter's request.

In the timbre they don't. In the FR they do. My pair of Paradox is not anywhere close to how I define neutral (what with those -6 dB high mids and >10k roll) - you must've got a more tuned one or something. It is notably bass-slanted, but not boomy at all, and the timbre is excellent - unlike the bit noisy feel I had for those other person's ASG-2.

Perhaps different insertion depth moved the resonances around? Customs are quite notorious for not being accurate at this...